1 B1 中性
指一系列事件:发生在某个重要时刻之前,并促成它。
"Tensions had been rising in the months leading up to the outbreak of the conflict."
“
In the days leading up to the invasion, diplomats made last-ditch attempts to avert war.
— Common news media phrasing; representative of BBC and broadsheet reporting style
不可分离